Having never had aikido used against me in anger, I can only therorise. But supposing in a fight, that someone tried kote-gaeshi you could counter it with irimi-nage. I think that practice of Kaishi Waza would come in handy for that. Same for armlocks/immobilisations. But for hard projections, irimi-nage, shio-nage, no chance, just hope your ukemi and insurance is up to scratch!

Aikido doesn't work? My Aikido works, what on earth are you practicing?!